Move document title ownership from document to version

Title is now owned by document_versions, following the same pattern as
classification and document_type. The documents.title column is made
nullable with a TODO to drop it. Backend loads title from a
latest_versions CTE for ordering purposes only. The frontend resolves
title from the latest version, and DocumentTitleForm now operates on
DocumentVersion using UpdateDocumentVersion mutation.

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

pkg/server/api/mcp/v1/schema.resolvers.go

@@ -2119,7 +2119,6 @@ func (r *Resolver) UpdateDocumentTool(ctx context.Context, req *mcp.CallToolRequ
 		ctx,
 		probo.UpdateDocumentRequest{
 			DocumentID:            input.ID,
-			Title:                 input.Title,
 			TrustCenterVisibility: input.TrustCenterVisibility,
 			DefaultApproverIDs:    defaultApproverIDs,
 		},
@@ -2224,6 +2223,7 @@ func (r *Resolver) UpdateDocumentVersionTool(ctx context.Context, req *mcp.CallT
 		ctx,
 		probo.UpdateDocumentVersionRequest{
 			ID:             input.DocumentVersionID,
+			Title:          input.Title,
 			Content:        content,
 			Classification: input.Classification,
 			DocumentType:   input.DocumentType,

pkg/server/api/mcp/v1/specification.yaml

@@ -5243,7 +5243,6 @@ components:
       required:
         - id
         - organization_id
-        - title
         - trust_center_visibility
         - status
         - created_at
@@ -5255,9 +5254,6 @@ components:
         organization_id:
           $ref: "#/components/schemas/GID"
           description: Organization ID
-        title:
-          type: string
-          description: Document title
         current_published_major:
           type:
             - integer
@@ -5522,9 +5518,6 @@ components:
         id:
           $ref: "#/components/schemas/GID"
           description: Document ID
-        title:
-          type: string
-          description: Document title
         trust_center_visibility:
           $ref: "#/components/schemas/TrustCenterVisibility"
           description: Trust center visibility
@@ -5655,6 +5648,9 @@ components:
         document_version_id:
           $ref: "#/components/schemas/GID"
           description: Document version ID
+        title:
+          type: string
+          description: Document version title
         content:
           type: string
           description: Document content in markdown format

pkg/server/api/mcp/v1/types/document.go

@@ -45,7 +45,6 @@ func NewDocument(d *coredata.Document) *Document {
 	return &Document{
 		ID:                    d.ID,
 		OrganizationID:        d.OrganizationID,
-		Title:                 d.Title,
 		CurrentPublishedMajor: d.CurrentPublishedMajor,
 		CurrentPublishedMinor: d.CurrentPublishedMinor,
 		TrustCenterVisibility: d.TrustCenterVisibility,